I prefer to remove the object in question and discard it into the trash with much aggravation and anger. I hate these things!
If I really wanted to keep object they're growing on, I would;
1) Remove object from tank and place in container of tank water.
2) Scrape aiptasia off with a blade of some sort.
3) Brush area with a Battlebrush or stiff toothbrush.
4) Rinse thoroughly. Several times.
5) Super glue over area with gusto.
6) Hope the little devils don't come back.
I've dealt with aiptasia in past setups. They are hard to get rid of once they multiply.
Aiptasia X has made them spread even worse for me in the past. Same with Joes juice. Stresses the aiptasia causing in to release babies by twisting off tentacles. And if you get either of those products on acro tissue, it'll kill that area, ime.